diff --git a/etc/syscalls_linux_aarch64.md b/etc/syscalls_linux_aarch64.md
index acb9369..40ff53f 100644
--- a/etc/syscalls_linux_aarch64.md
+++ b/etc/syscalls_linux_aarch64.md
@@ -277,7 +277,7 @@
 | 0x122 (290) | pkey_free               | (int pkey)                                                                                                                                 | __arm64_sys_pkey_free               | false       |
 | 0x123 (291) | statx                   | (int dfd, const char *filename, unsigned flags, unsigned int mask, struct statx *buffer)                                                   | __arm64_sys_statx                   | false       |
 | 0x124 (292) | io_pgetevents           | (aio_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct __kernel_timespec *timeout, const struct __aio_sigset *usig)  | __arm64_sys_io_pgetevents           | false       |
-| 0x125 (293) | rseq                    | (struct rseq *rseq, u32 rseq_len, int flags, u32 sig)                                                                                      | __arm64_sys_rseq                    | false       |
+| 0x125 (293) | rseq                    | (struct rseq *rseq, u32 rseq_len, int flags, u32 sig)                                                                                      | __arm64_sys_rseq                    | ENOSYS      |
 | 0x126 (294) | kexec_file_load         | (int kernel_fd, int initrd_fd, unsigned long cmdline_len, const char *cmdline_ptr, unsigned long flags)                                    | __arm64_sys_kexec_file_load         | false       |
 | 0x1a8 (424) | pidfd_send_signal       | (int pidfd, int sig, siginfo_t *info, unsigned int flags)                                                                                  | __arm64_sys_pidfd_send_signal       | false       |
 | 0x1a9 (425) | io_uring_setup          | (u32 entries, struct io_uring_params *params)                                                                                              | __arm64_sys_io_uring_setup          | false       |
diff --git a/libkernel/src/error/syscall_error.rs b/libkernel/src/error/syscall_error.rs
index 4d0783d..ee01986 100644
--- a/libkernel/src/error/syscall_error.rs
+++ b/libkernel/src/error/syscall_error.rs
@@ -37,6 +37,7 @@ pub const EPIPE: isize = -32;
 pub const EDOM: isize = -33;
 pub const ERANGE: isize = -34;
 pub const EWOULDBLOCK: isize = -EAGAIN;
+pub const ENOSYS: isize = -38;
 
 pub fn kern_err_to_syscall(err: KernelError) -> isize {
     match err {
@@ -47,7 +48,7 @@ pub fn kern_err_to_syscall(err: KernelError) -> isize {
         KernelError::Fs(FsError::NotFound) => ENOENT,
         KernelError::NotATty => ENOTTY,
         KernelError::SeekPipe => ESPIPE,
-        KernelError::NotSupported => EINVAL,
+        KernelError::NotSupported => ENOSYS,
         _ => todo!(),
     }
 }
diff --git a/src/arch/arm64/exceptions/syscall.rs b/src/arch/arm64/exceptions/syscall.rs
index 2563633..a5824cb 100644
--- a/src/arch/arm64/exceptions/syscall.rs
+++ b/src/arch/arm64/exceptions/syscall.rs
@@ -260,6 +260,7 @@ pub async fn handle_syscall() {
             )
             .await
         }
+        0x125 => Err(KernelError::NotSupported),
         0x1b7 => {
             sys_faccessat2(
                 arg1.into(),